Dynamic Model to Design Droop Control Strategies for Parallel Connected Inverters

OGGIER, GERMÁN GUSTAVO; BOTTERÓN, FERNANDO; CARBALLO, ROBERTO ESTEBAN; GARCÍA, GUILLERMO OSCAR

Mar del Plata

Congreso; XVII Reunión de trabajo en Procesamiento de la Información y Control; 2017

Facultad de Ingeniería de la Universidad Nacional de Mar del Plata

A dynamic model it is proposed to analyze the stability and the steady-state response of islanded parallel connected inverters controlled by a droop control strategy. Theproposed state space model allows to analyze the effects of the virtual impedance loop over the system stability boundaries. Furthermore, it enables to establish a compromise relationship between voltage regulation and the circulating current betweenthe parallel connected inverters, which facilitates the design of the virtual impedance loop. To validate the proposal, experimental results obtained in a prototype of two inverters connected in parallel feeding a 2kW load are presented